According to the British guardian, many ancient glaciers are melting due to global warming and the greenhouse effect. As we all know, glaciers store about 70% of the earth’s fresh water resources. If glaciers on the earth melt, it will not only have a great impact on the ecological environment, but also the rise of sea level will directly lead to the risk of coastal cities being submerged.
After consulting the national geographic data, we can know that the volume of existing ice on the earth is 20.85 million cubic kilometers. If all these glaciers melt, the world sea level will rise by 66 meters.
When it comes to China, some people will ask, if the global sea level really rises by 66 meters, which cities in China will be in danger of disappearing?
Low lying cities
The basic trend of China’s terrain is high in the West and low in the East, and the East is adjacent to the sea. If the sea level rises, many cities in the East will be submerged.
According to the prediction of scientists, Shanghai is the first to bear the brunt. Chongming Island is formed by the continuous impact of the Yangtze River Delta. The altitude of the plain is relatively low, only about 2.19 meters. The highest altitude is Dajinshan island in Jinshan District, with an altitude of about 104 meters. Therefore, after the sea level rises 66 meters, two thirds of Shanghai will be submerged into the ocean, and people living in Shanghai will be more comfortable They can only move to other higher places. Of course, not only Shanghai, but most cities in the East may disappear.
Because most of the eastern part of China is plain, the altitude is not high. For example, the North China Plain is only about 0-50 meters above sea level, so the North China Plain is also the next target that will disappear. In addition, many low-lying coastal cities will be submerged, such as Reykjavik, Iceland, Japan and the whole country. In this case, the people can only rely on immigration to survive.
The disadvantages of sea level rise
Sea level rise will not only make many cities disappear, but also lead to food shortage, which will lead to the global food crisis. Why is there such a saying?
Because the Yangtze River, the Yellow River and other rivers originate from the Qinghai Tibet Plateau, where there are many glaciers. If the glaciers melt, the rivers will be cut off, so there will be the risk of depletion of fresh water resources in the western region, and the cultivated land will be unable to be reclaimed.
According to satellite data, the eastern plain area is the concentration area of China’s arable land, which will be inundated by sea level rise. The arable land for farmers will be reduced, and the grain output will naturally decrease. Therefore, China’s food crisis should not be underestimated.
In addition to the above, the ocean current will also be damaged, the change of ocean current will cause the change of temperature and rainfall, and the abnormal climate will lead to the reduction of crop yield, which is self-evident.
But in the final analysis, all this is only the conjecture of Chinese geographers. What is certain is that the sea level has risen by three meters.
If glaciers do melt further, the whole planet will suffer.
Self regulation of the earth
Many people will wonder why, since ancient times, the earth’s temperature has been higher than it is now in some periods, but there are still creatures?
Take the ancient and new event as an example. It happened one day after the extinction of dinosaurs, Ten million years ago, the earth’s temperature was many times higher than today’s, and there were no glaciers in the polar regions, even temperate forests. Due to the relatively high temperature and rising sea level, mammals were forced to screen. After that, their size began to shrink, and the loss of primate population was also very heavy.
But the size of some cold-blooded animals has been forced to increase – they can’t maintain their own temperature, because the temperature will change with the external environment. High temperature is conducive to survival, so their size will break the limit. For example, scientists have discovered the largest fossil of snakes ever, growing to 18 meters.
The rising temperature of the earth and the rising sea level are very dangerous for human beings, as well as for animals. All this will lead to ecological imbalance, biological chain will break, and human beings and organisms may disappear. Therefore, to protect the earth, human beings should make the best judgment immediately. After all, it is also to protect human beings.